Mining machine



Dec. 23, 1930.

P; HOLMES MINING MACHINE Fil d Sep 1926 8 Sheets-Sheet l M'. P. -HOLMES MINING MACHINE File S p 1926 8 Sheets-Sheet 2 Qw mm Qw Q m mm \ aw i Dec. 23, 1930.

' M. P. HOLMES MINING MACHINE Filed Sept. 24, 1926 8 Sheets-Sheet 3 ffaZmea.

dztyi M. P. HOLMES Dec. 23, 1930.

MINING MACHINE File S p 1926 8 Sheets-Sheet 4 any.

De. 23, 1930. HOLMES I 1,785,961

MINING MACHINE Filed Sept. 24, 1926 8 Sheets-Sheet 5 V V-ML AM M. P. HOLMES MINING MACHINE Dec. 23, 1930.

File01 Sept- 1926 a Sheets-Sheet 7 6 operate ing low object be this invention is other object oi so bar may be means for said Patented Dec. 23, 1930 s'rarss PATET OFFICE MORRIS r. nomvrns, or oLAnEMoN'r, NEW CHINERY oeMrANxn com HAMPSHIRE; ASSIGNOR TO SULLIVAN MA- ORATION OF, MASSACHUSETTS MINING MACHINE Application filed September 24, 1926.

This invention relates to mining machines and more particularly to mining machines of the wheel mounted type adapted to operate from the mine traclzway.

3 An object of this invention is to provide an improved mining machine of the wheel mounted type. Another obj ect of this invention is to provide an improved miningmachine oithewheel mountedtype adapted to .al cutter. till another object of this invention is to provide an improved'mining machine of an exceedingly low compact character, especially adapted to use in mines havhead room. wherein improved and mechanisms are provided simplified driving for elevating and for propelling the machine, tilting the cutting mechanism, and for bodily rotatin the cutter carrying head. A further to provide an imzontal and vertical cutter type wherein the cutter bar may be expeditiously adjusted into a plurality oi? operative positions. Still anthis invention is to provide an improved mining machine of the wheel mounted type having improved elevating and tilting mechanism for the machine body whereby the elevation and angle of the cutter varied to suit different cutting conditions. Yet another object of this invention is to provide an improved mining ma-.

chine of the wheel mounted type having a machine body carrying a motor and elevating body and improved mechanism whereby the truck wheels may be driven from the motor irrespective of the elevation Q le oi the machine body relative to the wheels. A. still further object of this ion is to provide an improved simpliand exceedingly compact general arrangement ot a whereby the machine may be operated wi h facility and expeditiously in mines having narrow or low veins. Another object oi the inv means for rotating the cutter carrying head. These and other objects and advantages of mv invention will, however. hereinafter more fully appear.

Generally stated, the invention consists of ention is to provide improved either as a horizontal cutter or a verti chine shown in site side-"thereof from that shown in Fig. 2,

Serial No. 137,600.

the novel devices and combinations of devices hereinafter clearly described and defined in the appended claims. I

In the accompanying drawings I have shown for purposes of illustration one form and a modification which my invention may assume in practice. In these drawings-, r Fig. 1 is a top plan view of a mining machine constructed in accordance with an illustrative embodiment of my invention. Fig. 2 is a side elevational view of the machine shown in Fig. 1, the machine being shown in its lowered position.

' Fig. 3 is a side elevational view oi the ma Fig. 1 viewed from the oppothe machine being in its elevated position.

Fig. 1 is a' somewhat diagrammatic view illustrating the elevating and tilting means for the machine body, 'difierent positions thereof being illustrated by dotted lines.

Fig. 5

tending sectional view taken on line 5-5 of Fig. 2, parts being shown in plan.

Fig. 6 is a central vertical longitudinally extending sectional view taken on line 6-6 of Figs. 1 and 7. a

Fig. 7 is a horizontal view of the mecha nism shown in Fig. 6, the view being partially shown in section to illustrate details of construction. 7

Fig. 8 is a. transverse vertical sectional view taken on line 8-8 of Figs. 1 and 7.

Fig. 9 is a transverse vertical sectional view taken on line 9-9 of Figs. 3 and 6.

Fig. 10 is a transverse vertical sectional view taken on line 10-10 of Fig. 3.

Fig. 11 is a horizontal longitudinally extending sectional view taken on line 1111 of Fig. 2, the view being shown partially in plan.

Fig. 12 is a detail sectional view taken on line 1212 of Fig. 9 illustrating the triotional device for preventing inadvertent rotation of the rotating mechanism for the cutter carrying head when the controlling clutches are released.

is a horizontal longitudinally ex- 7, frame view taken on line l3-13 of Figs. 2, 3, and 11.

Fig. 13" is a de ail view illustrating the fast and slow speed driving worms.

Fig. 1 1 is a detail sectional view taken on line 1-l-1 l of Fig. 1.

Fig. 15 is a detail sectional view of the automatic clutch control for preventing excessive movement of the elevating and tilting mechanism for the machine body.

F ig. 16 is a detail sectional view taken on line 16-16 of Fig. 1 illustrating a portion of the operating connections for the bar rotating and truck drive controlling clutches and the reversing clutches therefor.

Fig. 17 is a detail setional view taken on line 17--17 of Fig. 16.

Fig. 18 is a detail sectional view line 18-18 of Fig. 1.

Fig. 19 is a detail sectional view taken on line 19-19 of Fig. 18.

Fig. 20 is a detail sectional View taken on line 20-2O of Fig. 18, parts being omitted to facilitate illustration.

F 21 is a detail view illustrating the control handle for the reverse controlling frictions of the elevating and tilting mechanism for the machine body.

Fig. 22 is a detail view, iartially in section, illustrating the controlling connection for the truck wheel brake.

Fig. 23 is a detail sectional View taken on line 2323 of Fig. 22.

F ig. 2a is a fragmentary plan view of a modified form of driving means for the reel for the electrical conductor cable.

Fig. 25 is a detail sectional view taken on line 2525 of Fig. 24 illustrating the guide rolls for the cable reel drive rope.

In this illustrative embodiment of my invention I have shown a mining machine designated as an entirety by the reference character 1, the machine being of the so-called universal type mounted on wheels and operating from the mine trackway. The mining machine 1 generally comprises a section 2 housing the driving connections for the cutting mechanism, a motor section 3, and a section 4 housing the transmission means for the truck drive, for rotating the cutter carrying head, and for elevating and tilting the machine body, these sections 2, 3, and 4 being suitably mounted on a wheel mounted frame generally designated 5. The wheel mounted 5 includes longitudinally spaced transverse frames 6 and 7 held in rigid spaced retaken on frame or angle members 8, the latter being suitably secured to the transverse frame members 6 and 7 as by screws 9, and the members 8 also support certain other portions of the machine as later described. As clearly shown in Figs. 5, 6, 9, and 10, the frame members 6 and 7 are respectively provided with semicircular bores which receive alined lation by parallel longitudinallv extending f bearing sleeves 10 and 11 in which cylindrical portions formed on frame sections 12 and 18 are respectively rotatably mounted, the frame sections 12 and 13 being connected as by bolts 14 respectively to the opposite ends of the motor section 3, while the frame member 12 is also suitably connected as by bolts 15 to the rear end of the cutter carrying head 2. The transverse frame members 6 and 7 are each horizontally split, as at 16, and are provided with detachable cap members 17 and 18 respectively each held in position by suitable screws 19, these caps retaining the hearing sleeves 10 and 11 in position and permitting removal of the cutter carrying and motor frames from their bearings. As illustrated, the frame section 4 which houses the transmission mechanism for the truck drive, the machine body elevating and. tilting mechanism, and head rotating mechanism is suitably rigidly secured to the longitudinally er; tending frame members 8 as by screws 20 and to the transverse frame member 7 by screws 21, the cutter carrying frame 2 and the motor frame section 3 being rotatable relative to the frame section 1 as hereinafter more fully described. As illustrated, suitably connected to the transverse frame members 6 and 7 are parallel supporting arms 22 and 23 wnich carry the truck wheels 24, the arms 22 and 23 and the wheels 24 constituting the supporting means for the machine.

In specifically describing my improved cut ting mechanism generally designated 2 it will herein be noted tl at housed within the motor section 3 is a suitable driving motor 26 herein preferably of the usual IQVGI hle electric type having a longitudinally ex nding horizontal armature shaft 2'? Fig. journaled at its forward end within a ball hearing 28 supported by a detachable head member 29. The rear end of the arn'iature shaft 2? is journaled in a ball bearing 30 supported by a detachable head member 31., the 1 ad mem bers 29 and 31 being suitably supported within the frame section The armature shaft 2'? has suitablysecured thereto at its forward end a member 32, the latter hav ng a splined connection wit.-. the end of a shaft alined with the armature shaft and jonrnaled atits forward end in a hall bear-- ing supported within the frame section 12. the rear end of the shaftheing supported by the ball bearing 28 for the forward end of the armature shaft 27. T he she ft 34' preferably formed integral therewith ill. 1 orward end and in front of the bearing- 3E3. a clutch member 36. As shown, the clutch member 36 internally bored at 37 to ceive a bal hearing wit-l n which. and a ball bearing suitab.y simported within it; frame section 2, a shaft 10 is iournaied. ti. shaft .:0 being alincd with shafts Set and The shaft 4-0 has suitably secured thereto at its rear end a clutch member which is adapted to be selectively connected by means of an axially movable clutch member 42 in driving relation with the clutch member The clutch members 36, 41, and 42 constitute what will hereinafter be called the main power controlling clutch. lhe operating mechanism .for this chitchv will be subsequently fully described.

As illustrated, the shaft 40 has preferably formed integral therewith, at its forward end, a bevel pinion 48 whicn meshes with a large'bevel gear 44 rotatable on an axis perpendicular to the axis of the shaft 40 and the gear 44 is journaled in suitable spaced alined ball bearings 45 suitably carried within the machine frame. The bevel gear 44 has preferably formed integral therewith a spur pinion 46, interposed between the gear 44 and the outer ball bearing 45, and this spur pinion meshes with a larger spur gear 47. The 47 is provided with an annular depending bearing sleeve 47 journaled on spaced alined ball bearings 48 surrounding and supported by a cutter chain driving shaft 49 disposed on an axis parallel with the axis of the gear 44 and journaled respectively its opposite ends within ball bearings 50 and 51. the former bearing-50 being supported wi hin a deachable cover plate 52 secured to the frame section 2, while the latter bearing 51 is can ried by a cylindrical bearing portion 53 cured as by screws 54 to a turntable or swivel mount' 55 for an elongated cutter bar 56. The shaft 49 has secured thereto at one end, by a key and a radially expansiblesplit washer connection 57, a cutter chain drivi g sprocket 58 of well known form which 1.. adapted to be driven through suitable connections h reina'fter described by the motor driven gear 47. A cutter bit carr tin chain 59 is adapted to be circulated oi I about the outer edges of the cutter bar 58 and is driven by the sprocket 58 in the usual manner. As illustrated, a resiliently positioned annular p ackingring 60 is interposed between the cylindrical portion 53 and the adjacent plane surface of the cutter chain sprocket 58 and this member 60 prevents the entry of any foreign substance and thus prevents damage to and excessive wear of the drive sprocket shaft bearings and the cutter chain controlling clutch mechanism. This packing ring also prevents oil leakage from the ca p The cylindrical bearing portion 53 for too cutter bar is rotatably mounted within aboaring sleeve 61 supported by an annuL-r porsing.

tion 62 of the machine frame. As shown, the

clutch for connecting the ar 47 the sprocket 58 in driving relation comprises a clutch member 63 secured to the shaf 49 intermediate its ends as by a key This clutch also includes a clutch member 65 rotatably mounted on a bearing; sleeve 66 carried b the shaft 49 and the hub of this clutch member 65 is connected as b a semi-permanent clutch 67, to the adjacent. end of the bearing sleeve 47 for the gear 47. These clutch members 63 and 65 are adapted to be connected in driving relation by means of a slidable clutch member 68 formed on a flanged shipper member 69 with which shipper mechanism later described may cooperate. It will thus be evidcntthat by suitably actuating the-clutch member 68' the sprocket 58 may be connected in driving relation with the motor or remain idle at the will of the operator, thus permitting thecutter chain to be movedin its orbit or remaini'dle.

In my improved bar swinging mechanism it will herein be observed that the cutter bar 56 is adapted to be swung or slued about its pivot by suitable mechanism hereinafter described. of the same general type as that disclosed in my copending applications Ser. No. 694,139, filed Feb. 20, 1924 and Ser. No. 6,477, filed Feb. 2, 1925. This bar swinging mechanism includes means for swinging the bar at a slow cutting speed in one direction or at a fast bar positioning speed in the opposite direction. In specifically describing the mec-hanisin for swinging the bar, it will be noted that the gear 47 meshes with spur pinions 70 and 7 O which have respectively secured. thereto worms 71 and 71 suitably journaled in the cutter carrying head as clearly shown inFig. 8 and having teeth of different lead. These worms mesh with slow and fast feed worm gears 72 and 7 2 respectively as clearly shown inFigs. 7 and 8. The worm gears 72 and 72*" are made hollow and each carries therein'a series of clutch disks 73 which are interleaved with a corresponding series of clutch disks 74 carried by a clutch member 75 keyed, as at 76, to the ends of a shaft 77 disposed transversely of the machine. The worm gears 72 and 72 are journaled on ball bearings 78 supported by the clutch members 75, while the shaft 77 is journaled at its opposite ends in ball bearings 79 supported within the cutter carrying head 2. Plate members 80 are provided for applying pressure to the friction disks and these members are provided with a central bore 81 through which an operating shaft 82 extends, the shaft 82 extending coaXially through the sh aft 77 and having secured thereto at its opposite ends, operating handles 83 and The shaft 82 is threadedly connected as at 84 to one end of the shaft 77. Each of the'clutch members 7 5 is retained on the shaft 77 by means of a lock nut 85 threadcdl connected to the shaft The handles 83 and 83 respectively engage the clutch shipper members 80. It will thus be evident that upon rotation of the rod 82 the latter is moved axially relative to the shaft 77 thereby forcing one plate 80 against an end clutch disk, applying the clutch and consequently connecting one or the other of the worm gears 72 and 7 2 r 116 has a portion 117 engap-in to the shaft 77 to effect rotation of the latter in the desired direction at the desired speed. As illustrated,a worm 86 is preferably formed integral with the shaft 77 and meshes with a worm gear 87 (see also F 6), keyed as at 88 to a member 89 loosely journaled on a shaft 90, the shaft 90 being disposed parallel with and in front of the shaft 49. The shaft 90 is journaled in suitable spaced alined ball bearings 91 and 92 at its ends, the former hearing 91 being car ried within a detachable cover plate 93 secured to the frame section 2, while the latter bearing 92 is supported within a. retaining member 94 also carried within the frame section 2. The shaft 90 has preferably formed integral therewith a spur pinion 96 which meshes with a large internal gear 9? disposed with its axis coincident with the axis of the sprocket 58 and bolted, at 98, to the turntable or swivel mounting 55 for the cutter bar 56. This mounting also provides a guard for the machine end of the cutter bar. Furthermore, it will be observed, formed between the internal gear 97 and a radially flanged portion 99 formed integral with the cutter bar mounting 5a is a circumferentially extending groove 100 within which thrust ring- 101 projects the ring: being suitably secured, as by bolts 102, to the frame section 2. The shaft 90 has secured thereto at the end thereof opposite from the spur pinion 9, as by a key 103, a clutch member 104-, while the member 89 has preferably formed thereon a clutch member 105. The clutch members 104 and 105 are adapted to be connected in driving relation by means of an axially movable clutch member 106. Obviously upward movement of the clutch member 106 disconnects the clutch member 104 from the worm gear 87 and permits the free rotation of the latter and free swinging; movement of the cutter bar.

It is desirable to first make a power connection of the cutting mechanism gearing, thereafter to effect bar swing if necessary and then finally to engage the clutch which eff cts cutter chain driving sprocket rotation. 'lhis predetermined sequence of operations is accomplished by rotation of operating handlcs 10'? mounted upon a shaft 108 extending transversely of the machine. The shaft 108 carries thereon in. non-rotative relation thereto a disk 109 provided with a cam pjroove 110. This cam groove comprises a plurality of ar cuate or nonanovei nt producing portions and plurality of more nearly chordal portions producing movement of the elements controlled thereby and within the cam groove there are engaged three rollers 111, 112, and 113. The roller 111 is rotatabiy mounted upon a shaft 114 extend ng across the bifurcated end 115 of a lon udinally extendingre iprocahle clutch shipper rod 116. The rod in the peripheral groove 118 of the clutch shipper gear 42 of the main power controlling clutch. The roller 112 is rotatably mounted upon a transversely extending shaft 119 which extends etween the rearward ends of brackets 120 mounted upon the rearward ends of a pair of parallel longitudinally slidable actuating rods 121 which are pivotally connected at their forward ends as at 122 to depending arms 123 rotatabiy supported by means of sleeve journal members 124 upon the shaft Th journal members 124 also carry forward y projecting parallel arms 125 having por us 126 engaging in the annular groove 12? of the clutch shipper gear 106. The roller 113 is journaled upon a shaft 128 connecting the spaced arms 1.29 of the clutch shipper yoke 130 whose fork 31 operatively engages in the annular groove 69 in the reciprocable cutter chain driving sprocket engaging clutch 68. From the foregoing it will be obvious that the movements of the roller 111. control the connection of the main power controllin clutch comprising the elements 36, 41. and 42. that the movements of the roller 112 control the connection of the clutch member 104 with the worm gear 87 and so determine whether the cutter bar shall be free for pi votal movement or shall be locked or swung by power as may be determined by the operation of the handles 83 and 83 and the position of roller 113 determines whether or not the cutter chain driving sprocket shall be operatively connected to the driving gear 47. The operation of this improved common cam control for the clutches heretofore described is clearly described in my copending applica tion, Ser. No. 109740, filed May 17, 1926 and therefore further description herein is con sidered unnecessary.

In specifically describing, my improved truck wheel propulsion mechanism it will herein be noted that the rear end of the armature shaft 27 has secured thereto as by a. key a member 136 which is splined as at 137 to a shaft 138, the front end of the shaft 138 being supported by the member 136, while the rearward end of this shaft is journaled in a ball bearing 139 suitably carried within the frame section 4 as clearly shown in Figs. 5 and 11. This shaft 138 has secured thereto at its rear end as by a key and bolt connection 140 a spur pinion 141 which meshes with a larger spur gear 142 suitably secured to ashaft 143 suitably journaled within the frame section 4, the shaft 143 being disposed parallel with the shaft 138 and slightly below the latter (see also Fig. 13). The shaft 143 has keyed thereto, as at 144, a fast feed worm 145 which meshes with a worm gear 146. Also secured to the shaft 143 between the worm 145 and the spur gear 142 is a spur pinion 147 which meshes with a larger spur gear 148 secured to a shaft 149 disposed parallel with the shaft 143 and in the same transverse horizontal plane. The shaft 149 has keyed thereto, as'at 150, a slow speed worm 151 which meshes with a worm gear 152. As shown, the worm gears 146 and 152 are journaled on ball bearings 153 carried by a horizontal shaft 154 disposed transversely of the machine and journaled at its opposite ends in ball bearings 155 suitably carried Within the frame section 4, the central portion of the shaft 154 being journaled in a ball bearing 156- carried within a retaining member 157 suitably supported within an annular boss 158 formed within the frame section 4. As the clutch mechanisms for connecting the gears 146 and to the shaft 154 to efiect rotation of the latter at a fast or at a slow speed are substantially identical,-detailed description of one will suffice for both. The gear 146 is made hollow and carries therein a series of clutch disks 159 which are interleaved with corresponding series of clutch disks 160 carried by a clutch member 161 keyed, as at 162, (see Fig. 11) to the shaft 154. Encircling the clutch member 161 and axially slidable thereon isa clutch applying member 163. Also encircling the clutch members 161 and disposed at opposite'ends of the shaft 154 are clutch shipper members 164 and 165, suitable ball thrust bearings 166 being interposed between the members 163 and the members 164, 165 respectively. As clearly shown in Fig. 13 disposed above the shaft 154 and parallel therewith is a pluralpart actuating rod 167 slidably mounted in bores 168 formed within the frame section 4.

Pivotally connected adjacent the opposite ends of the rod 167, as at 169, are clutch shipper yokes 17 cooperating respectively with the clutch shipper members 164 and 165. These clutch shipper y-okes 170 are also pivotally connected, as at 171, to link members 172, these link members in turn being pivotally connected, as at 17 3, to a portion of the machine frame. As shown, the intermediate portion of the actuating rod 167 is transversely slotted at the top and bottom thereof, as at 174, and the bifurcated end of a pivoted lever 17 cooperates with these slots as clearly shown in Fig. 14. The lever 175 is pivoted,

as at 176, on the machine frame and carries on its arm opposlte from its bifurcated end a nut 17 7 which is threadedly connected to a rotatable operating rod 178, the latter carrying at its outer end an operating handle 179 (see Fig. 1). It will thus be evident that upon suitable manipulation of the handle 179 the rod 178 is rotated and consequently the nut 177 is moved axially relative to the rod, effecting swinging movement of the lever 17 5 and sliding the actuating rod 167 axially thereof, swinging the shipper yokes 170 about their pivots 171, consequently applying the desired friction clutch to connect either the fast speed or the slow speed worm gear in driving relation with the shaft- 154. The

shaft 154 is rotated in the same direction at a. slow speed or ata fast speed at'will. As clearly shown in Figs. 11 and 13 suitably secured to one end of the shaft 154 is a bevel pinion 180 which meshes with bevel gears 181 and 182, these gears 181 and 182 rotating in opposite directions and constituting a reversing mechanism as hereinafter fully described for driving the truck wheels and rotating the cutter carrying head in opposite directions. The gears 181 and 182 are each provided with a hub portion 183 journaled on a bearing sleeve 185 and ball bearings 185 carried by a shaft 186, this shaft being disposedperpendicular to the shaft 154 and extending longitudinally of the machine. As shown, the shaft 186 is journaled at its opposite ends-on suitable ball bearings 187 carried within detachable cover plates 188 suitably secured within the frame section 4. Carried within each of the gears 181, 182 is a series of clutch disks 189 which a-re'interleaved with a corresponding series of clutch disks 190, respectively carried by clutch members 191 keyed,

as at 192, adj ac'entthe opposite ends of shaft 186. Encircling the hubs of the gears 181, 182 are clutch applying members 193 having fingers, projecting through apertures formed in their respective gears into engagement with the clutch disks. Disposed intermediatethe clutch applying members 193 and encircling the hubs of the bevel gears is a clutch shipper 194, suitable ball thrust'bearings 195 being disposed between the clutch shipper member 194 and each of the clutch applying 'members 193. Cooperating with the peripheral groove formed on the clutch shipper member 194 is a clutch shipper yoke 196 pivotally connected to a nut member 196 adjustably mounted on an actuating rod 197, the latter being slidably mounted within alined bores 198 formed within the frame section'4. The operating mechanism for the clutch shipper yoke 196 will be subsequently described. It will thusbe evident that when the clutch within one or the other of the bevel gears 181, 182 is applied, the shaft 186 may be rotated in one direction or the other and also at either a fast or a slow speed under the control of the friction clutches 159, 160 for the worm gears 146, 152. As shown, secured to the forward end of'the shaft 186 as by a detachable coupling member 199 and alined therewith is a shaft 200 which is j ournaled at its forward end in a ball bearing 201 carried within a detachable cover member 202 suitably secured to the transverse frame member 7. The shaft 200 has secured thereto at its forward end a bevel pinion 203 which meshes with a largercbevel gear 204 rot-atably mounted on a horizontal shaft 205 disposed perpendicular to the shaft 200 and extending trans-' versely ofthe machine as clearly shown in Fig. 5. The shaft 205 is journaled at its op-v posite ends in alined ballbearings 206 suit ably earriedby the transverse frame member 7. Herein preferably formed integral with the bevel gear 204 is a spur gear 207, while preferably formed integral with the shaft 205 is a spur gear 208 and these gears 207 and 208 are adapted to be connected in driving relation by means of an axially movable internal shipper gear 209. The actuating mechanism for the shipper gear 209 will be subsequently described. Secured to the outer end of the shaft 205 as by a screw and key connection 210, is a chain sprocket 211 and this chain sprocket is connected, as clearly shown in Fig. 10, by an endless chain connection 212 to a chain sprocket 213. The chain sprocket 213 is secured, as by a key and screw connection 214, to a horizontal shaft 215 extending transversely of the machine. Secured to the end of the shaft 215 opposite from the sprocket 213 as by a key 216 is a chain sprocket 217. Connected as by a semi-permanent clutch 218 to the inner end of the chain sprocket 217 is a sleeve member 219, this latter member in turn being clutched, as at 220, to a chain sprocket 221. The sprocket 221 is connected as by an endless chain connection 222 to a sprocket 223 keyed, as at 22st, to one end of a horizontal axle 225 disposed below and parallel with the shaft 215 and by which the rear truck wheels 24 are carried. The axle 225 is journaled at its opposite ends in suitable roller bearings 226 carried within the lower end of the supporting arm 23. The shaft 215 is journaled at its opposite ends in suitable roller bearings 227 carried Within the opposite sides of the transverse frame member 7. As shown, the upper end of each supporting arm 23 is rotatably mounted for swinging movement on roller bearings 228 supported by the shaft 215. In accordance with this invention the chain sprocket 217 is connected as by an endless chain connection 229 to a chain sprocket 230 secured as by a key and screw connection 231 to a horizontal shaft 232, the

V latter being journaled at its inner end in a ball bearing 233 while the outer end of this shaft is journaled in a roller bearing 234, these bearings being carried by the frame section 6. Axial displacement of the shaft 232 is prevented by means of a retaining disk 235 engaging the inner race of the ball bearing 233 and a bolt 236 extends coaxially through the shaft 232 and is threadedly connected, as at 236 to the disk 235. As clearly shown in Fig. 9 the chain sprocket 231 is connected as by a clutch connection 237 to a sleeve member 238 supported on the shaft 232 and this member 238 is in turn connected as by a clutch 239 to a chain sprocket 240. The chain sprocket 2 10 is connected, as by an endless chain connection 241, to a chain sprocket 2&2 keyed, as at 243, to the front truck an le 2424, the latter being disposed parallel with the axle 225 heretofore described. The axle 244 carries the front truck wheels 24 and is journaled at its opposite ends in roller bearings 2 each carried within the lower end of the supporting arm 22. The upper end of the arm 22 is rotatably mounted for swinging movement on a roller bearing supported at the side thereof adjacent the sprocket 230 on the shaft 232, while the other side is supported on a roller bearing 2457 supported by a shaft 248 to be described later.

In this instance, the shipper gear 209 is adapted to be shifted axially by means of a shipper yoke 250 (see Figs. 10 and keyed, as at 251, to a rotatable rod 252. The shipper yoke 196 has threaded thereto a bifurcated member 251 (see Figs. and 20) which embraces a reduced portion 252 formed on the rod 252. The member 251 and the groove 252 form the fulcrum for the inner end of the shipper yoke. Further, the rear end of the rod 252 has secured thereto an arm 253 having a forked portion 25 1 embracing a circumferentially grooved portion 255 formed on a horizontal rod 256 disposed transversely of the machine and suitably guided thereon. Secured to the rod 256 as shown in Figs. 1 and 17 is a handle 257. The operator may grasp the handle 257 and slide the rod 256 axially, swinging the arm and consequently rotating the rod 252, thereby effecting axial movement of the shipper gear 209. It will be evident that when the gears 207 and 208 are connected by the shipper gear 209, it being understood that the shaft 200 is rotating, the truck wheels may be driven. Furthermore, as the shaft 200 may be rotated in opposite directions and either at fast or slow speeds, it is also evident that the truck wheels may be rotated in opposite directions at either a fast or a slow speed.

In specifically describing the improved mechanism for bodily rotating the motor casing and cutter carrying head to vary the plane of the cutter bar, it will be noted that meshing with the bevel gear 20%- (see Fig. is a bevel pinion 258 secured to the rear end of a shaft 259 alined with the shaft 200 and journaled at its rear end in a ball bearing 260 carried by a detachable cover plate 261 suitably secured to the transverse frame member 7. The forward end of the shaft 259 is connected, as by a detachable coupling member 262, to the rear end of a shaft 263, the latter being journaled at its forward end in a ball bearing 26% carried within a detachable cover plate 265 suitably secured to the transverse frame member 6. As shown, the shaft 263 has secured thereto, at its forward end, a bevel pinion 266 which meshes with a bevel gear 267 rotatably mounted on a horizontal shaft 268 disposed parallel with the shaft 205 heretofore described. The shaft 268 is ournaled at its opposite ends in alined ball bearings 269 carried by the transverse frame member 6. Herein preferably formed interelation by means of an axially movable in-] ternal shipper gear 272. It will further be noted that secured to the outer end of the shaft 268 as by a key and screw connection 273, is a chain sprocket 27 i and this sprocket is connected by means of anendless chain:

connection 275 with a chain sprocket 276 secured as by a key and screw connection 277 to the outer end of the shaft 248. The shaft 248' is journaled in ball bearings 278 and a r ller bearing 279 carried by the transverse frame member 6. As clearly shown in Figs. 6 and 9 the shaft 248 carries adjacent its inner end a worm 280 which meshes with a worm gear 281 (see also Fig. 5) secured by bolts 282 to the frame member 12 and disposed coaxially with the motor. It will be observed that the frame member 12 is preferably composed of two parts to facilitate manufacture, assembly and the dismantling of the machine. The gear 272 is adapted to be shifted axially by means of a shipper yoke 283 (see Figs. 9 and 20) keyed, as at 284, to the rotatable rod 252. The shipper yokes 250 and 283 are so arranged that when the shipper gear 209is connected the shipper gear 272 is disconnected and vice versa. From the foregoing description it will be evident that when the gears 270, 271are connect-ed by the gear 272, it being understood that the shaft 263 is rotating, the worm gear 281 is consequently rotated and the cutter bar may thus be moved;

to operate in different planes, i. e. a horizontal plane or a vertical plane or in any desired intermediate plane. As shown in Figs. 16, 17, and 19 improved connections are provided to permit the rod 256 to also control the application of the clutches 189, 190 for alternative- 1y connecting the reverse bevel gears 181., 182 in driving relation with the shaft 186. This mechanism comprises a lever 285 suitably secured as by a bolt 286 to a member 287 having adjustably mounted thereon an eccentric pin 288 which is disposed in a bore 289 formed in a 7 member 290, the latter being threadedly connected, as at 291, to one end of a link 292. As a iown in Fig. 17 the opposite end of the link 292 is pivotally connected at 293 to a member 294, the latter member having a bifurcated portion 295 connected by slot and belt 296, to the rod 256. Secured to the end of the rod 256 adjacent the rod 252 as shown in Figs. 18 and 19 is an arm 297 having its projecting end 298 cooperating with a bifurcated portion 299 formed on a bell crank300, the latter being pivotally mounted, as at 301, on the machine frame. The arm 302 of the bell crank 300 opposite from the bifurcated portion projects within an aperture 303 formed within the rod 197 (see alsoFig. 11).

- From the foregoing, it will be evident that when the operator suitably manipulates the lever 285 and the rod 256 is rotated, the rod 252 remains stationary, the groove 255 in the rod 256 permitting free rotation of the latter relative to the shipper arm 253. As the rod 256 is rotated the arm 298 causes the bellcrank 300 to be swung about its pivot 301 thereby effecting axial movement of the rod 1971and the desired-clutch 189, 190, controlling the connection of the gears 181, 182 to the shaft 186, is applied. It will also be notedthat when the shaft 256 is moved axially to effect rotation of the rod 252 the projection 298 formed on the arm 297 merely slides within the bifurcated portion 299 of the bellcrank 300, thereby permitting the rod 197 toremain stationary.

ln speci ically describing the improved mechanism for elevating and tilting the machine body, it will herein be noted that secnredby a key 304C to the end of the shaft 154: opposite from the bevel gear 180 is a bevel pinion 305 (see Fig. 11) which meshes with .ievel 306 and 307. The bevel gears 306 307 rotate in opposite directions and concute a re, ersing mechanism. Furthermore e ars 306 and 39'." are each provided with h b portion 308 journaled on a bearing 309 and ball bearings 309 carried by a shaft 310, this shaft being disposed perpeni o the shaft and extending-longiof the machine. As shown, the

g 311 carried within detachable s 312 suitably secured within the frame section 4. Carried within each of the s 306 and 307 is a series of clutch disks which is interleaved with a corresponding series of clutcn disks 31 1 respectively carried by c utch members 315 keyed, as at 316, adjacent the opposite ends of the shaft 310. Encircling the hubs of the gears 306, 307 are clutch applying members 317 having fingers projecting through apertures formed in their respective gears into engagement with the end clutch disks. Disposed intermediate the clutch applying members 317 and encircling the bevel gears is a clutch shipper the hubs or member 31 suitable ball thrust bearings 319 being disposed between the clutch shipper member 318 and each of the clutch applying members 317. Cooperating with the peripl 'eral groove formed on the clutch shipper member 318 is a clutch shipper yoke 320 pivotally connected to member 320 adjustably mounted on a rod 321, the latter being slidably mounted within alined bores 322 formed wit on the mac e frame, as at 323, (see Fig. 21) is an operating handle 324 in the form of a bell-crank and having one ofits arms 325 projecting within an aperture 326 formed within the rod 321. It will thus be evident that when the operator suitably'manipulates the handle 324 the rod 321 is moved axially is jonrnaled at its opposite ends on n the frame section l. Pivoted in the desired direction, thereby effecting application of the desired friction clutch and the shaft 310 is consequently rotated in one direction or the other. The forward end of the shaft 310 is connected, as bv a detachable coupling member 327 (see Fig. 5) to the rear end of a screw threaded shaft 328, this shaft 328 being journaled at its forward end in the bearing sleeve 329 carried within a detachable cap member 330 suitably secured to a clutch housing 331, the latter in turn being rigdily secured to the adjacent frame member 8. As illustrated, secured to the forward end of the shaft 328 as by a key and lock nut connection is a spur gear which is adapted to be connected by means of an axially movable internal shipper gear 334 to a spur gear secured by a key and lock nut connection 336 to the rear end of a similar screw threaded shaft 337 alined with the shaft 328 and this shaft 337 is journaled at its rear end in a bearing sleeve 338 carried by a detachable cap member 339 suitably secured to the clutch housing 331. Interposed between a flange 340 formed on each of the shafts 328, and the hubs of each of the gears 333 and 335 is a ball thrust bearing 341 and these bearings absorb the thrust of the shafts 328 and 337 in either direction. The screw threaded shaft-s 328 and 337 are respectively threadedly con nected as at 342 to nut numbers 343 and 344 of rectangular cross section slidably mounted in su table guide ways, these members 343, 344 each having formed thereon at the bottom thereof, teeth 345 which cooperate with teeth 346 formed on arcuate members 347 and 348 secured as by screws 349 to the machine supporting arms 22 and 23, respectively. As shown in Fig. 5 the internal gear clutch member 334 is adapted to be shifted axially by means of a shipper yoke 350 having an elongated guide portion 351 slidably mounted in a slot or guide way 352 formed within the clutch housing A screw 353 is threadedly connected to the shipper yoke 350 and projects outwardly through an elongated slot- 354 formed in the gear housing 331 and this screw carries thereon a resiliently positioned operating member 355, a spring 356 being provided for yieldably maintaining the Operating member 355 in engagement with locking apertures in the gear housing. From the foregoing description it will be evident that when the gears 333 and 335 are connected by the gear 334, l that the shaft 310 is rota g, the screw threaded shai s 328 and 33. are also rotated and consequently the nut members and 344 are moved Xially in their guides thereby swinging the supporting arms 22 and 23 respectively about their supporting bearings 246, 247, and 228 and the machine body is consequently elevated or lowered as desired. Furthermore, it will be noted that if the gears and are disconnected the shaft 337 remeans stationary While the shaft 328 rotates, consequently effecting swinging movement f only the ear supporting arm 23 and tiltthe machine body about the front truck axle 244. It is obvious that the arms 22 and 23 may be swung in opposite directions at either a fast or slow speed.

Axial movement of the members 343 and is limited by improved automatic stop ind clutch release mechanism which comprises a reciprocable rod 357 disposed parallel with and above the shafts 328 and 337 as clearly shown in Figs. 9 and 10. The rod 357 has secured thereto at longitudinally spaced points stop or abutment members 358 and 359 having depending portions projecting within flattened or slotted portions 360 formed on the members 343 and 344 respectively. The ends of these slotted portions in the members and 344 are each provided with abutments 361. The rear end of the rod 357 is circumferentially grooved at 362 and the reduced portion of this rod is embraced by a bifurcated member 363 (see Fig. threadedly connected as at 364 to the shipper yoke 318 (see Fig. 11) The groove 362 and the member 363 form the fulcrum for the inner end of the shipper yoke 318. is clearly shown in Fig. 15 disposed on opposite of a relatively stationary abutment 365 formed on the upper portion of the clutch housing 331 and encircling the rod 357 are coiled springs 366 and 366, respectively engaging adjustable collars 367 and 368 threadedly connected to the rod. These springs are adapted to normally maintain the clutch shipper member 318 in its neutral or inoperative position: From the foregoing it will be evident that before the nut members and 344 reach their limit of movement in opposite directions the stop members 358 and 359 engage one or the other of the end abutments formed on the members 343, 344 respectively and upon continued movement of these nut members the rod 357 is shifted axially and the clutch 313 and 314 connecting one or the other of the gears 306, 307 to the shaft 310 is automatically released, consequently preventing excessive movement of the members Therefore, the rotation of the screw threaded shafts 328, 337 is automatically discontinued when the ma chine body reaches its extreme elevated, lowered, or tilted positions.

To prevent inadvertent rotation of the shaft 243 carrying the worm 280 and consequently of the cutter carrying head a friction device generally designated 369 is provided (see Figs. 9 and 12) which comprises a plurality of semicircular plate members 370 keyed to the shaft 248 as at 371, and reacting between these members 370 are suitable coiled springs 372 which force the members 370 outwardly against the inner surface of a sleeve 373, the latter being held in non-rotative relation with respect to an annular hub portion 374 formed on the frame section 6 by means of a radial pin 375. The frictional engagement between the sleeve 373 and the members 370 retards rotation of the shaft 248 and consequently the worm 280 when the clutches controlling rotation of the shaft 248 are released, thereby preventing unintentional rotation, due to vibration or other causes, ofthe gear 281 at that time. A. similar frictionretarding device generally designated 376 (see Fig. 7 is provided for the bar swing shaft 77 and this friction device resists rotation of the worm 86 when the bar swing controlling clutches are released. As this frictional de vice 376 is clearly described in my copending application Ser. No. 6,477 mentioned above, further detailed description of the sameis herein deemed unnecessary. i

As illustrated, electric current is adapted to be conducted to the electric driving motor 26 through suitable conductor cables 377, 378, 379 (see Fig. 11). The cable 377 is -connect. ed to a suitable cable reel 380 journaled, as at 381, upon a bracket member 382 suitably carried by the frame members '8- Suitable slip ring connections (not shown) are provided between the reel and connector plugs 383, the

cables 378, 379 leading respectively from these connector plugs through certain electricaldevices hereinafter described to a housing member 384 carried on top of the transverse frame member 7 (see Fig. 10). The wires housed within the conductor cables 378, 379 are connected through suitable terminals 385 and wires 386 to resilient contact members 387 suitably secured to the cap member 18. These contact members 387 slidably engage slip rings 388 (see also Fig. 5) secured as by screws 389 to a cylindrical member. 390, the latter in turn being connected as by screws 7 391 to a member 392. The member 392 surrounds the shaft 138 and is journaled at its opposite ends within bores 393 and 394 formed within the frame sections 13 and 4 respectively. p The forward end of the member 392 is connected as by a semi-permanent clutch 395 to the head member 31. It will thus be evident that the contact rings 388- rotate bodily with the motor and current is adapted to be supplied through these slip rings and the sliding contacts to the motor irrespective of the position of the motor frame relative to the frame 4. The cable-reel 380 is adapted to be rotated by power in opposite directions and the mechanism for accomplishing this is clearly shown in Fig. 11. Secured as by a key 396 is a clutch memher 397 which is adapted to be connected to a clutch member 398 by means of a'clutch applying member 399 to be later described.

The clutch member .398 is keyed at -400 to a shaft 401, the latter in turn being connected 7 through a universel joint 402 of a well known form to ashaft 403. As shown, the shaft 403 has secured thereto at its rear end a bevel pinion 404which meshes with a bevel gear 405 suitably secured to the reel drive shaft. The clutch applying member 399 is adapted to be shifted axially to effect frictional engagement between the members 397 and 398 by means of a shiftable member 406 encircling the hub of the member 398. I nterposed between themember 399 and the member 406 is a ball thrust bearing 407. Cooperating with, the grooved periphery of the member 406 is a shipper yoke'408 formed on one arm of a lever 409 pivoted at 410 on a yieldable mounting 411. The other arm of the lever 409 is provided with a bifurcated portion 412 which cooperates with the grooved periphery of a rotatable nut 413, the latter having formed thereon a hand wheel 414 and is threadedly connected, as at 415, to a stationary threaded member'416. It will thus be evident that when the hand wheel 414 is rotated it moves axially-relative to the threaded member 416, consequently swinging the lever about its pivot 410 thereby causing a driving connection between the shaft 186 and the shaft 401 and the reel is consequently ro tated. The mounting 411 is adapted to yield upon overload. Also mounted on the rear end of the supporting frame adjacent the reel is a main lineswitch and fuse box 416, a rheostat'417, and a controller 418, the uses of which are well known and need not herein be described other than to state that the cables378, 379 lead into and from the same. It will also be observed fromFigs. 1 and 2 that. suitable sand boXes 419 and 420 are carried by the supporting frame for supply i ng sand to-the track rails to lessen the pos sibility of slippage betweenthe truck wheels and the rails, especially when the'machine is moving up a steep incline. L

Improved braking means is also provided for controlling rotation of the truck wheels and this means comprises aIrotatablebrake drum 421 (see Fig. 10) connected as by a semipermanent clutch 422 to the chain sprocket 221 and thisbrake drum is supported by the shaft 215. 'A similar rotatable brake drum 423 is carried on the opposite side of the longitudinal vertical centerof the machine and brake shoes429 are loosely supported on the.

transverse frame member 7'by means of bolts 431, there being a slight clearance between the openings in the brake shoes and the supporting bolts to permit limited movement of the brake shoes toward and from each other. It is evident that when the truck wheels rotate the brake drums 421, 423 simultaneously rotate therewith. To effect frictional engagement between the brake drums and the relatively stationary brake shoes axially movable applying members 432 are provided surrounding the shaft 215 and slidable longitudinally thereon. Interposed between the inner adjacent ends of the members 432 (see also F igs. 22 and 23) is a shipper yoke 433 piv- Otally connected, as at 434, to a member 435 secured as by a screw 436 to a horizontal rod 437 reciprocable transversely of the machine and slidably mounted in bores 438 formed in the machine frame. An operating lever 439 is provided pivotally mounted as at 440 on the machine frame and the lower end of this lever is connected as by a pin and slot connection 441 to the outer end of the rod 437. It will thus be evident that when the lever 439 is swung about its pivot the rod 437 is shifted axially and the shipper yoke 433 consequently fulcrums against the adjacent end surfaces of the members 432, thereby forcing them apart and applying the brakes. A notched segment 442' is provided for maintaining the lever 439 in its different adjusted positions, a dog 443 carried by the lever cooperating with the notches in the segment.

In the modification shownin Figs. 24 and 25 it will be observed that the driving con nections between the shaft 403 and the cable reel 380 shown in the preferred form of my invention have been slightly modified. As clearly shown in Fig. 24, secured to the rear end of the shaft 403 is a pulley 445 with which a flexible endless belt or rope connection 446 cooperates, this flexible rope connection passing around guide sheaves 447 and 448 (see Fig. 25) adjustably mounted at 449 and 450 respectively on a detachable bracket 451 carried by the machine frame. The rope passes from these guide rolls 447, 448 around the pulley 452 suitably secured to the reel driving shaft. The bracket 451 is adapted to be held in different adjusted positions relative to the machine frame by means of a nut and screw connection 453.

The general mode of operation of the machine will now be described. It will be assumed that the machine is moving forwardly about the mine along the trackway in the main entry at a fast or transport speed under the control of the friction clutch 159, 160. connecting the fast feed worm gear 146 to the shaft 154 and the clutch 189, 190 conneeting the bevel gear 181 to the shaft 186 and when the working face of the coal is reached, these clutches are then released. It is obvious that upon application of the clutch 189, 190 connecting the bevel gear 182 to the shaft 186 the machine may be propelled rearwardly at a fast speed. If an undercut is desired to be made, the main power controlling clutch 36, 41, 42, and the bar swing controlling clutch 104, 105, 106 are connected and the operator then manipulates the handle 83 controlling the fast bar swinging friction and the bar'is swung or shied about its pivot at a fast speed to a point adjacent the right hand rib, the fast feed bar swing clutch thereafter being released. The cutter chain controlling clutch 63, 65, 68 is thrown into operative driving relation and the cutter chain sprocket 58 is then actuated through transmission means from the motor. The friction clutch 159, 160 for connecting the slow speed worm 152 to the shaft 154 and the clutch 189, 190 connecting the bevel gear 181 to the shaft 186 are applied and the clutch 207, 208, 209 is connected and the bar is sumped or fed into the coal at a slow or cutting speed, the machine moving bodily along the trackway at that time. The worm 86 and worm gear 87 prevent rotation of the bar swinging mechanism and lock the cut :er bar 56 in position at this time. 1V hen the sumping cut is completed, the operator swings the lever 439, eifcctin application of the brakes 421, 423, 429, preventing rotation of the shaft 215 and consequently rotation of the truck wheels. The handle 83 is then ma nipulated and the slow speed bar swing friction clutch is applied and the bar is swung about its pivot to effect the swinging cut at a cutting speed, the slow bar swinging clutch thereafter being released. The truck wheel brake is then released and the clutch 207, 208, 209 is connected and the clutch 189, 190 connecting the bevel bear 182 to the shaft 186 is applied, reversing the rotation of this shaft, and the cutter bar is withdrawn from the coal at a cutting speed, the worm 86 and the worm gear 87 maintaining the bar in locked position as the machine moves bodily rearwardly along the mine track vay. If it is desired to make a shear or vertical cut the clutch 270, .271, 272 is connected, caus ng tation of the worm 280 and worm gear 281 and the cutter carrying head and motor casing are bodily rotated into a vertical position within the bearings 10 and 11. The worm 280 and worm gear 281 maintain the bar r0- tating mechanism in its adjusted position at this time. The cutter bar is then swung npwardly about its pivot at a fast speed to a point adjacent the mine roof. The cutter bar is thereafter sumped into the coal at a cutting speed, the machine moving bodily along the trackway. The bar is then swung downwardly at a cutting speed to the bottom of the mine, and the bar is thereafter withdrawn at a cutting speed from the coal. in a manner substantially similar to that heretofore described in regard to the horizontal out. If it is desired to vary the elevation of the cutter bar and the machine body the clutch 333, 334, 335 is connected, the friction clutch 313, 314 connecting the bevel gear 306 to the shaft 310 is applied, it being understood that the clutch 159, 160 connecting the slow speed worm gear 152 to the shaft 154: is still applied, and the screw threaded shafts 328, 337 are simultaneously rotated, sliding the nut elements 343, 3&4: in their guideways and swinging the toothed arcuate members and consequently moving the machine body upwardly to the desired elevation. If it is desired to lower the machine the friction clutch 313, 314 connecting the bevel gear 307 to the shaft 310 is applied and the toothed arcuate members are swung in the opposite direction consequently lowering the machine body. If it is desired to tilt the cutter bar the clutch 333, 334:, 335 is disconnected and upon rotation of the screw threaded shaft 328 the threaded nut 343 is moved in its guideway while the nut member 3&3 remains stationary, thereby causing only the rear supporting arm 23 to be swung about its pivot, thereby swinging the machine about the front truck axle and thus varying the angle of the machine body relative to the horizontal and consequently. the angle of the cutter bar relative to the mine bottom. It is obvious that u 3011 a lication of the friction clutch 396, 398 the cable reel 380 may be rotated as desired. Other operations and advantages of my invention will be clearly apparent to those skilled in this art;

WVhile I have in this application specifically described one form and a modification thereof which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims. 7

What I claim as new and desire to secure by Letters Patent is 1. In a mining machine, supporting means, a machine body mounted thereon and carrying cutting mechanism, and means for elevating said body relative to said supporting means comprising parallel pivoted a ms, and means for swinging said arms about their pivots comprising gear. segments carried thereby and engaged concentric with their pivots, nut members having teeth cooperating with said gear segments, separate screws cooperating with said nut members, and means for simultaneously rotating said screws for moving said nut members axially relative thereto.

2. In a mining machine, supporting means, a machine body mounted thereon carrying cutting mechanism and a driving motor, and means for elevating said body relative to said supporting means comprising parallel pivoted supporting arms, and means for swinging said arms about their pivots comprising gear segments carried thereby and arranged concentric with their pivots, nut members having teeth cooperating with said gear segments, separate screws cooperating with said nut members, and means driven by said motor for simultaneously rotating said screws to effect axial movement of said nut members relative thereto.

3. In a mining machine, supporting means,

a machine body mounted thereon carrying cutting mechanism and a driving motor, and means for elevating said body relative to said supporting means comprising parallel pivoted supporting arms, and means for swinging said arms about their pivots comprising gear segments carried thereby and arranged concentric with their pivots, nut members having teeth cooperating with said gear segments, separate screws cooperating with said nut members, and means driven by said motor for simultaneously rotating both of said screws in one or its opposite direction.

4. In. a mining machine, supporting means, a machine body mounted thereon carrying cutting mechanism and a driving motor, and means for elevating saidbody relative to said supporting means comprising parallel pivoted'supporting arms, and means for swinging said arms about their pivots comprising gear; segments carried thereby and arranged concentric with their pivots, nut members having teeth cooperating with said gear segments, separate screws cooperating with said nut members, and means driven by said motor for simultaneously rotating both of said screws in one or its opposite direction and at different speeds in either direction.

5. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprising spaced arms pivoted between their ends and having wheels at one side of their pivots, and means for swinging said arms about t ieir pivots comprising separate shafts mounted on said body and movably connected to said arms at the other side of their pivots, an dmeans for simultaneously adjusting said shafts.

'6. in a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprising spaced arms'pivoted between their ends and having wheels at one side of their pivots, and means for swinging said arms about their pivots comprising separate shafts mounted on said body and movably connected to said arms at the other side of their pivots. and means for simultaneously rotating said shafts.

7. in a mining machine, a body including utting mechanism, and vertically adjustable supporting means therefor comprising spaced pivoted arms, wheels on said arms, and means for swinging said arms about their pivots comprising arcuate toothed-members on i said arms concentric with their pivots, separate rotatable threaded shafts mounted on said body, cooperating threaded members having teeth in mesh with the teeth on said members, and means for simultaneously rotating said shafts for elfecting axial movement of said threaded members relative thereto.

8. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprising spaced pivoted arms, wheels on said arms, and means for swin 'ing said arms about their pivots comprising arc-uate toothed members on said arms concentric with their pivots, a mechanical connection between said members including separate rotatable threaded shafts mounted on said body, cooperating threaded members having teeth in mesh with the teeth on said arcuate members, and means for simultaneously rotating said shafts for moving said members axially.

9. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor compri ing spaced pivoted arms, wheels on said arms, and means for swinging said arms about their pivots comprising arcnate toothed members on arms concentric with their pivots, a mechanical connection l etween said members including separate rotatable threaded shafts mounted on said body. cooperating threaded members having teeth in mesh with said arcuate members, and means for rotating said shafts for adjusting said threaded members axially.

10. In a mining machine, a body including cutting mechanism and vertically adjustable supporting means therefor comp *ising spaced pivoted arms, wheels on said arms, and means for swinging said arms about their pivots comprising arena-t toothed members on said arms concentric with their pivots, mechanical connection between said members including separate rotatable threaded shafts mounted on said body, cooperating threaded members having teeth in mesh with said segments, and means ror rotating said .hafts for simultaneously adj Listing said members axially.

11. In a mining machine, a body including cutting mechanism, pivoted arms on body carrying S211 ortin wheels, a motor in said body, a counter-shatt mounted on said body and having a reversible drivine con- I k m nection with said motor, a driving connection between said shaft and the wheels, arcuate toothed members on said pivoted arms concentric with their pivots, separate longitudinally ei-:teni;ling rotatable threaded mounted on said body, cooperating threaded members having teeth in mesh with said gear segn'lents, and means for imparting rotary movement to said longitudinally extending shafts by power from said counter-shaft for moving said members axially.

12. In a mining machine, supporting mea er means, a machine body thereon carrying cutting mechanism, means for elevating said body relative to said supporting means comprising coaxially arranged screw members one of which is rotatable relative to the other, and means for connecting said members for simultaneous rotation.

13. In a mining machine, supporting means, a machine body thereon carrying cutting mechanism, and means for elevating said body relative to said supporting means comprising parallel pivoted arms, and means for swinging said arms about their pivots comprising arcuate toothed members secured to said arms concentric with their pivots, axially movable toothed members meshing ith said arcuate toothed members, screws cooperating with said last mentioned toothed members, and means for simultaneously rotating said screws for moving said nut members axially relative thereto.

is. in a mining machine, supporting means, a machine body mounted thereon carrying cutting mechanism, and means to vary the angle of said machine body relative to said cutting mechanism including pa 'allel pivoted arms, and means for swinging said arms about their pivots comprising arcuate toothed members carried by said arms conceni h their pivots, members having teeth ith said arcuate members, and ns for eiiecting axial movement of one of said last mentioned toothed members relative to the other.

15. In a mining machine, supporting means, a cutter carrying head rotatably mounted thereon, and means for rotating said head at a relatively high cutter positioning speed and at a relatively slow speed compris ing coax'al fast and slow speed worm gears, a shaft arranged coarially with said gears, said ears and shaft arranged with their axes parallel to a vertical plane extending transversely of the machine, and means for selectively connecting said gears to said shaft.

16. In a mining machine, supporting means, a cutter carrying head rotatably supported thereon, a motor having a casing rotatable and said head, and means driven by said motor for rotating said head comprising coaxial Worm gears, a shaft arranged coaxially therewith, said gears and shaft arranged with their axes parallel to a vertical plane extending transversely of the machine, and means for selectively connecting said gears to said shaft.

17. In a mining machine, supporting means, a cutter carrying head rotatably mounted thereon, said head carrying for rotation therewith a motor for actuating said cutter, and means driven by said motor for rotating said head relative to said supporting means comprising a worm gear encircling the head axis and secured to said head, a Worm mesh- 

